<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="password" name="pwd"  data="passworedtype"/>
    <script>
        //  let fc = 2**3
        //  console.log(fc);


        // var wy = Symbol('bar')
        // var we = Symbol('foo')
        // console.log(wy);

        // var user ={
        //     age:18
        // }
        // user[Symbol('name')] = '王德发'
        // user[Symbol('name')] = '李富贵'

        // console.log(user.age);
        // console.log(user);

        // var arr = [66,99,66,44,66,77]
        // var fo =  new Set([11,22,11,11,10])
        // var to = new Set(arr)
        // console.log(fo);
        // console.log(to);

        

    </script>
</body>
</html>